given that the elements in an array $arr, array are 0 to NMagi N < = $NMMI 1, find out whether there are any duplicate elements. The time complexity is O (n), and the space complexity is O (1) ....
The manual says that gatewayworker can get the ip, of the other party through $_ SERVER [ REMOTE_ADDR ], but there is no way to determine the specific source of the information in the local area network, and it cannot be specific to a certain device. I...
problem description it is known that I have a turntable with four (not fixed) contents. At present, I can successfully get the information of the target item after rotation (subscript). but I can never turn the turntable to the expected position (for...
whether the product data isNew is a new product, I want to add a picture as a separation between the new model and the old model. The data is in a list, and the background first gives the isNew is 1 how can I insert a picture in a for cycle "...
this is the oc library I depend on in podspec after I pod install in the swift project, I did not write the .h file of these libraries in the umbrella file. How do I configure it ...
the program first executes a start method to take up a lot of memory, and then executes endEmpty to call System.gc () to run, the task manager can see that the memory footprint of the program immediately reaches 4G, but the memory footprint of th...